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| Winter Term 2018/19, Doctoral School Events | |
| 2018-11-16 | Doctoral School Seminar (Inst. Mathematik, Heinrichstr. 36, 14:00—16:30, KFU) |
| Jordan McMahon (KFU, advisor K. Baur): Higher cluster-tilting for algebras of type A2d⊗A2d via abstract barycentric algebras [show abstract] | |
| Arnur Nigmetov (TU, advisor M. Kerber): Distributed merge tree computation on AMR data with local exchanges [show abstract] | |
| Nicola del Giudice (TU, advisor M. Kang): Subcritical random hypergraphs [show abstract] | |
| Lukas Andritsch (KFU, advisor K. Baur): A note on friezes of type Λ4 and Λ6 [show abstract] | |
| 2018-12-7 | Doctoral School Seminar (Seminarraum 2 des Instituts für Geometrie, Kopernikusgasse 24, 10:30—13:00, TU) |
| Gundelinde Wiegel (TU, advisor W. Woess): The Frog Model: A Model for information spreading [show abstract] | |
| Rene Corbet (TU, advisor M. Kerber): A Kernel for Multi-Parameter Persistent Homology [show abstract] | |
| Martin Schwinzerl (KFU, advisor G. Haase): SixTrackLib: Towards Modular, Scalable and Numerically Efficient Symplectic Particle-Tracking [show abstract] | |
| Stefan Lendl (TU, advisor B. Klinz): Dispersing obnoxious facilities on a graph [show abstract] | |
| 2019-01-18 | Doctoral School Seminar (Inst. Mathematik, Heinrichstr. 36, 14:00—16:30, KFU) |
| Michael Preischl (TU, advisor R. Tichy): Optimal reinsurance for Gerber-Shiu Functions in the Cramer-Lundberg Model [show abstract] | |
| Hannah Schreiber (TU, advisor M. Kerber): Discrete Morse Theory for Computing Zigzag Persistence [show abstract] | |
| Amr Ali Al-Maktry (TU, advisor S. Frisch): On Null Polynomials of Higher Order [show abstract] | |
| Mahadi Ddamulira (TU, advisor R. Tichy): On the x-coordinates of Pell equations which are k-generalized Fibonacci numbers [show abstract] | |
| 2019-02-01 | Doctoral School Seminar (Seminarraum 2 des Instituts für Geometrie, Kopernikusgasse 24, 10:30—13:00, TU) |
| Laura Marx (KFU, advisor G. Plank): Personalizing computational models of left ventricular electro-mechanics and the circulatory system [show abstract] | |
| Irene Parada (TU, advisor O. Aichholzer): Unavoidable Configurations in Simple Drawings [show abstract] | |
| Karli Gilette (KFU, advisor G. Plank): Automized Parameterization of a Human Biventricular Cardiac Model of Electrophysiology Based on Non-invasive Clinical Recordings [show abstract] | |
| Gernot Holler (KFU, advisor K. Kunisch): A bilevel approach for parameter learning in inverse problems | |
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Abstract: We address a learning approach for choosing regularization weights in multi-penalty Tikhonov regularization of ill-posed inverse problems. As motivating examples, we consider the inverse problems of estimating parameters in elliptic partial differential equations. Assuming that some ground truth data is given, the basic idea is to learn regularization weights by solving a bilevel (optimization) problem. While bilevel problems are typically non convex, it is often assumed that at least the lower level problems are convex. However, this is in general not the case for non linear parameter estimation problems. This leads to significant issues when deriving optimality conditions. We discuss these issues and describe how they can be resolved for specific examples.[hide abstract] |